BS EN ISO 3303‑2:2020 pdf download.Rubber- or plastics-coated fabrics — Determination of bursting strength.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
A test piece is securely clamped around its edges between an upper and lower clamp. A diaphragm fitted beneath the lower clamp is gradually stretched into a dome by forcing fluid at a constant rate into a chamber under the diaphragm, thus causing it to make contact with, and apply pressure to, the test piece. The pressure of the fluid and the height of the dome at failure of the test piece are recorded.
5.1.2 Type B test machine (see Figure 2), measurement range between 70 kPa and 1 400 kPa,
comprising the elements specified in 5.1.2.1 to 5.1.2.3.
5.1.2.1 Clamping system, for clamping the test piece firmly and uniformly between two annular,
plane, parallel surfaces which shall be smooth (but not polished) and grooved as described in Figure 2,which also gives the dimensions of the clamping system. One clamping plate shall be held in a swivel joint or similar device so as to ensure that the clamping pressure is distributed evenly. Under the load used for testing, the circular openings in the two clamping faces shall be concentric to within 0,25 mm and the clamping surfaces shall be flat and parallel.
5.1.2.2 Diaphragm, circular in shape, made of natural or synthetic rubber and 0,86 mm ± 0,06 mm
thick, clamped securely, before the test begins, with its upper surface recessed about 3,5 mm relative to the upper surface of the lower clamp. The material and construction of the diaphragm shall be such that the pressure required to cause the diaphragm to bulge 9,0 mm ± 0,2 mm beyond the upper surface of the lower clamp is 30 kPa ± 5 kPa.
Diaphragms in use shall be regularly checked and changed should the bulge‑height requirement be no longer met.
5.1.2.3 Hydraulic system, to apply an increasing hydraulic pressure to the inside of the diaphragm
until the test piece bursts. The pressure shall be generated by a motor‑driven piston forcing a suitable liquid (e.g. pure glycerol, low‑viscosity silicone oil or ethylene glycol containing corrosion inhibitor) which is compatible with the diaphragm material against the inner surface of the diaphragm. The hydraulic system and the fluid used shall be free from air bubbles. The pumping rate shall be 95 ml/min ± 5 ml/min.
5.2 Pressure-measuring system to measure bursting strength, giving a rate of response to the
rising hydraulic pressure which is such that the indicated maximum pressure is within ± 3 % of the true peak pressure.BS EN ISO 3303‑2 pdf download.